COVERING ELEMENT FOR A HINGE ADJUSTING NOTCH OF A FRAME ASSEMBLY AND A FRAME ASSEMBLY COMPRISING SUCH A COVERING ELEMENT

Abstract

 The invention relates to a covering element (1) of a hinge adjusting notch (51) in an edge of an element (61) of a frame assembly (6) defined by a longitudinal projection (5) with a curved cross-section. A covering element (1) according to the invention comprises a main part (2) with an L-shaped cross section comprising a central arm (21) and a side arm (22), wherein the main part (2) at both ends transforms into bent parts (3) with L-shaped cross sections comprising central arms (31) and side arms (32), wherein the side arms (22, 32) of the main part (2) and the bent parts (3) are on the same plane, and the central arms (31) of the bent parts (3) extend from the central arm (21) of the main part (2) in the direction of the longitudinal axis (01) of the central arm (21) of the main part (2) and are bent with respect to the plane of the central arm (21) of the main part (2) in the opposite direction relative to the direction of a projection of the side arm (22) of the main part (2), and wherein the bent parts (3) comprise first positioning projections (33) protruding from their central arms (31) at transverse displacement distances (D1) from their side arms (32) and at depth displacement distances (D2) from the ends of the central arms (31) of the bent part (3) in the direction perpendicular relative to the plane of the central arm (21) of the main part (2), wherein the first positioning projections (33) define transverse positioning edges (331) preferably forming positioning planes on the side of the side arms (32) of the bent parts (3) and recessed positioning edges (332) preferably forming positioning planes on the side of the ends of the central arms (31) of the bent parts (3), and the main part (2) comprises at least one second positioning projection (23) protruding from its central arm (21) at a second transverse distance (D3) from its side arm (32), preferably equal to the transverse distance (D1) of the first positioning projections (33), wherein the second positioning projection (23) defines a transverse positioning edge (231) on the side of the central arm (21) of the main part (2).

Description

[0001] The invention relates to a covering element of a hinge adjusting notch in an edge of an element of a frame assembly defined by a longitudinal projection with a curved cross-section, preferably L-shaped or C-shaped. The frame assembly element is preferably a longitudinal profile element. The invention also relates to a frame assembly comprising such a covering element.

Background of the Invention

[0002] It is well known in the art to arrange the fastening elements of the hinge members of the hinge arrangement of an openable sash of door and window joinery on frame and sash surfaces facing each other in a closed state. Both the sash and the frame are made of longitudinal elements, preferably sectional, connected at corners to form a polygonal (usually rectangular) frame assembly. Such a method of mounting a hinge arrangement allows to completely hide these mounting areas of hinge members in a closed state of a sash and thus automatically block access to a mounting area of the hinge arrangement in a closed state of the sash (which is of course desirable or most often even required, as it prevents unauthorized persons from removing the sash and thus obtaining unauthorized access to the space fenced off therewith). In typical solutions of this type, the axis of such a hinge arrangement is located on the outside of the plane of the sash-frame assembly, and the hinge member in the closed state of the sash extends to this axis through the gap between peripheral edges of the frame and sash in a direction perpendicular to the plane of the frame assembly. At least one of said edges through which said hinge member passes through has a curved cross-section, typically of an L-shaped or C-shaped curvature. This curvature serves for mounting a circumferential seal adjacent to the second frame assembly secured thereto by said hinge arrangement.
For technological and aesthetic reasons, the width of the gap through which the hinge member passes is relatively small, and in many cases only slightly greater than the thickness of the part of the hinge member located in this gap. Therefore, there is a very limited range of the available adjustment of the position of this hinge member with respect to the shaped frame member to which the frame member is attached in the plane of the frame assembly and in a direction perpendicular to the longitudinal axis of the frame assembly.

[0003] Such prior art solutions are schematically illustrated in cross-section view in Pos. I. The hinge arrangement 7' hingedly connects the frame element 6a' (door leaf) to the frame element 6b' (frame) by means of hinge members 71a' and 71b' connected to each other on a common pin 72'. The hinge member 71b' is fastened by screws to one of the longitudinal elements 61b' of the frame 6b', and the hinge member 71a' is attached to one of the longitudinal elements 61a' of the sash 6a' by means of adjusting means 73' of said longitudinal member 71a' of the element 61a' in the plane of the frame assembly 6a' in a direction perpendicular to the longitudinal axis of the profile longitudinal element 61a'. The adjusting means 73' are shown symbolically as a rectangular block containing a double-headed arrow symbolizing the possibility of displacing the member 71a' relative to the longitudinal element 61a' by these means. Many different types of such adjusting means are known in the art. The longitudinal element 61a' comprises a circumferential edge defined by a curved longitudinal projection 5' with L-shaped curvature. The hinge member 71a' of the hinge arrangement 7' extends through this peripheral edge 5' in a direction perpendicular to the plane of the present sash frame assembly 6a' in the gap between the peripheral edges of the frame 6b' and the sash 6a' with a width only slightly greater than the thickness G' of the hinge member 71a' located therein. A very narrow gap 62' of the width R' is defined between the hinge member 71a' of the hinge arrangement 7' and the peripheral edge 5' of the longitudinal element 61a' in the plane of the sash frame assembly 6a'. The gap width 62' between the peripheral edge 5' of the longitudinal element 61a' and the hinge member 71a' connected to this element 61a' by the adjusting means 73' determines the adjustment range R' of the adjusting means 73'. As it is visible, this adjustment range is very narrow and in many cases insufficient. As shown in Pos. I, the elements 6b', 61b', 71b' are depicted using dashed lines as less important for the present invention.
Moreover, it is evident that, in a cross-section, the edges of the hinge members of the closed hinge arrangement as shown in Pos. I actually overlap with each other. However, in order to improve the readability of Pos. I, the edges of the member 71b' are slightly shifted with respect to their actual position to make them clearly visible.

[0004] An example of such a solution is known from the patent publication WO2011060835A1.

[0005] It has been the object of the present invention to provide solutions that provide a relatively wide range of an adjustment of a position of a hinge member with respect to a longitudinal member of a frame assembly to which the hinge member is attached in the plane of the frame assembly and in the direction perpendicular to the longitudinal axis of the longitudinal member, without a need to excessively increase the width of a gap between edges of the hingedly connected assemblies of the joinery.

Summary of the Invention

[0006] The present invention provides a covering element of a hinge adjusting notch in an edge of a preferably longitudinal and section-shaped element of a frame assembly, wherein the edge is defined by a longitudinal projection with a curved cross-section, preferably L-shaped or C-shaped, as defined in the outset which is characterized in that it comprises:

a main part with an L-shaped cross section comprising a central arm and a side arm,

wherein the main part at both ends transforms into folded parts with L-shaped cross sections comprising central arms and side arms,

wherein the side arms of the main part and the bent parts are on the same plane, and

the central arms of the bent parts extend from the central arm of the main part in the direction of the longitudinal axis of the central arm of the main part and are bent with respect to the plane of the central arm of the main part in the opposite direction relative to the projection of the side arm of the main part,

and wherein

the bent parts comprise first positioning projections protruding from their central arms at transverse displacement distances from their side arms and at depth displacement distances from the ends of the central arms of the bent parts in the direction perpendicular relative to the plane of the central arm of the main part, and

wherein the first positioning projections define transverse positioning edges, preferably forming positioning planes, on the side of the side arms of the bent parts and recessed positioning edges, preferably forming positioning planes, on the side of the ends the central arms of the bent parts, and wherein

the main part comprises at least one second positioning projection protruding from its central arm at a second transverse distance from its side arm, preferably equal to the transverse distance of the first positioning projections, wherein the second positioning projection defines a transverse positioning edge, preferably a positioning plane, facing the side arm of the main part.

[0007] In preferred embodiments of the present invention, the bent parts transform into closing parts of L-shaped cross sections including central arms and side arms, wherein the side arms of the main part, the bent parts, and the closing parts being coplanar, and the central arms of the main part and closing parts are in planes parallel to each other, and
wherein the first positioning projections protrude from the central arms of the bent parts at depth displacement distances from the central arms of the closing parts in a direction perpendicular relative to the planes of the central arms of the closing parts, and wherein the first positioning projections define recessed positioning edges (332), preferably forming positioning planes, on the side of the central arms of the closing parts.

[0008] According to the invention, it may be advantageous for the bent part to be an arcuate section with an L-shaped cross-section.

[0009] The said bent part of the covering element according to the invention is preferably a rectilinear section with an L-shaped cross-section and has the central arm protruding from the central arm of the main part at an acute angle with respect to the plane the central arm of the main part.

[0010] The second positioning projection of the covering element according to the invention is preferably a flat-bar projection protruding from the opposite edge of the central arm of the main part with respect to its side arm.

[0011] The invention further relates to a frame assembly comprising longitudinal elements having a peripheral edge defined by a longitudinal projection with an inwardly curved cross-section, preferably L-shaped or C-shaped cross-section, and the hinge member of the hinge arrangement attached to the longitudinal element and extending through the peripheral edge in a direction perpendicular to the plane of the frame assembly and coupled to adjusting means for adjusting the position of the hinge member relative to the longitudinal element in the plane of the frame assembly in a direction perpendicular to the longitudinal axis of this longitudinal element, which is characterized in that, a hinge adjusting notch with a flat-bar edge is formed in the longitudinal projection of the peripheral edge, in which a covering element as defined above is installed, wherein the flat-bar edge of the hinge adjusting notch is provided in the space between the central arm, the side arm and the second positioning projection of the main part of the covering element;
the central arms of all parts of the covering element are on the outside of the longitudinal projection of the circumferential edge in a direction parallel to the plane of the frame assembly;
the side arms of all parts of the covering element are provided on the outside of the side surface of the longitudinal projection of the circumferential edge; and
the first positioning projections are provided inside the longitudinal projection with an inwardly curved cross-section of the longitudinal element on both sides of the hinge adjusting notch, and transverse positioning edges preferably forming the positioning planes, and the recessed positioning edges, preferably forming the positioning planes, of the first positioning projections rest on the inner surface of the longitudinal projection of an inwardly curved cross section.

[0012] The present invention provides an additional extension of a range of an adjustment of the position of the hinge member with respect to the frame assembly longitudinal member in the plane of the frame assembly and in a direction perpendicular to the longitudinal axis of the longitudinal member without the need to additionally increase the gap between the edges of the frame assemblies connected by a hinge arrangement comprising the adjustable hinge member. The edge of the hinge adjusting notch proposed according to the invention, providing such an extension of the adjustment range, is according to the invention effectively protected against damage by the covering element of the present invention. Preventing from a direct access to this edge of the hinge adjusting notch by using the covering element according to the present invention also improves the operational safety of the frame assembly of the present invention, since this edge formed (e.g. milled) in a prefabricated finished frame assembly or longitudinal element intended to produce a frame assembly may have sharp edges. Moreover, the present invention provides additionally a high aesthetic value for the frame assembly according to the invention, which, despite having an increased range of adjustment of the hinge member, does not need to have an enlarged gap with respect to the second frame member hingedly connected thereto, and the additional hinge adjusting notch is aesthetically hidden under the covering element according to the invention.

Brief description of drawings

[0013] The invention shall be described and explained below in connection with the attached drawings in which:

Figs. 1 and 2 schematically show the gist of the present invention;

Figs. 3, 4, 5 and 6 show a first embodiment of the covering element according to the invention for a hinge adjusting notch in an axonometric rear view and in top, rear and side views, respectively;

Figs. 7, 8 and 9 are axonometric views of a second embodiment of the covering element according to the invention for a hinge adjusting notch according to the invention;

Figs. 10, 11 and 12 are respectively top, rear and side views of a second embodiment of the covering element according to the invention a hinge adjusting notch according to the invention;

Figs. 13-16 are axonometric views of a part of an embodiment of a frame assembly according to the present invention comprising the covering element illustrated in Figs. 7-12; and

Figs. 17 and 18 show axonometric views of the adjusting means of the embodiment of the frame assembly illustrated in Figs. 13-16; and

Figs. 19 and 20 show cross sections of a part of the embodiment of the frame assembly of Figs. 13-18 in two positions of relative positioning of the hinge member with respect to the longitudinal member of the frame assembly.

Detailed description of preferred embodiment

[0014] Figs. 1 and 2 generally show the gist of the present invention in a manner corresponding to Pos. I illustrating the state of art.
The frame assembly 6a depicted therein comprises a plurality of longitudinal profile elements, wherein the figures show a cross-section of one longitudinal element 61a to which a hinge member 71a of a hinge arrangement 7 connecting the frame assembly 6a to the second frame assembly 6b is attached by means of hinge adjusting means 73. The second hinge member 71b connected to the longitudinal element 61b of the second frame assembly 6b by means of screws is pivotally connected to the first hinge member 71a on a common pin 72. The frame assembly 6a is a door leaf hingedly connected by means of a hinge arrangement 7 in a frame assembly 6b constituting a frame.

[0015] The adjusting means 73' shown symbolically as a rectangular block serve to adjust the position of the hinge member 71a with respect to the longitudinal element 61a in the plane of the sash frame assembly 6a in a direction perpendicular to the longitudinal axis of the profile longitudinal element 61a. The longitudinal element 61a comprises a peripheral edge defined by a curved longitudinal projection 5 with an L-shaped curvature in which a longitudinal, trapezoidal hinge adjusting notch 51 is formed, in which is mounted the first embodiment of the covering element 1 according to the present invention as shown in Figs. 3-6.

[0016] The hinge member 71a of the hinge arrangement 7 extends through this perpendicular edge 5 in a direction perpendicular to the plane of the frame assembly 6a' in the area of this hinge adjusting notch 51, and the gap 62 defining the adjustment range of the adjusting means 73 is in this case significantly wider than the corresponding gap 62' shown in Pos. I (width R greater than width R') and extends from the hinge member 71a to the covering element 1 installed at the edge of the hinge adjusting notch 51.

[0017] In this case, by means of the adjusting means 73, it is possible to bring the frame assembly member 6a much closer to its hinge member 71a, which, in the extreme shift position shown in Fig. 2, can be inserted into said hinge adjusting notch 51 and abut against the circumferentially outer surface of the covering element 1 of the present invention.

[0018] Similar to Pos. I, in Figs 1-2, the elements 6b, 61b, 71b are depicted with dashed lines as less important for the present invention, and the edges of the member 71b are slightly shifted from their actual position to make them clearly visible.

[0019] Figs. 3-6 show a first embodiment of a covering element 1 according to the invention which has been inserted into the hinge adjusting notch 51 of the projection 5 of the frame assembly 6a shown in Figs. 1-2.

[0020] The element 1 comprises a main part 2 which at its both ends transforms into rectilinear bent parts 3.

[0021] The main part 2 has an L-shaped cross-section and comprises a central arm 21 and a side arm 22. Likewise, the bent parts 3 have L-shaped cross-sections comprising central arms 31 and side arms 32.
The side arms 22, 32 of the main part 2 and the bent parts 3 are in the same plane. The central arms 31 of the bent parts 3 extend from the central arm 21 of the main part 2 in the direction of the longitudinal axis O1 of the central arm 21 of the main part 2. Additionally, the central arms 31 of the bent parts 3 are bent with respect to the plane of the central arm 21 of the main part 2 at an acute angle α in the opposite direction relative to the direction of the side arm 22 protrusion from the main part 2. The bent parts 3 comprise first positioning projections 33 protruding from their central arms 31 at transverse displacement distances D1 from their side arms 32 and at depth displacement distances D2 from the ends of the central arms 31 of the bent parts 3 in a direction perpendicular relative to the plane of the central arm 21 of the main part 2.

[0022] The first positioning projections 33 define transverse positioning edges 331 (in this embodiment forming a plane) on the side of the side arms 32 of the bent parts 3, and recessed positioning edges 332 (in this embodiment forming a plane) on the side of the ends of the central arms 31 of the bent parts 3. Whereas the main part 2 comprises one second cuboidal positioning projection 23 protruding from its central arm 21 at its center at a second distance D3 from its side arm 32. The second displacement distance D3 is in this embodiment equal to the transverse displacement distance D1 of the first positioning projections 32. The second positioning projection 23 defines a transverse positioning edge 231 (in this embodiment having a form of a plane) on the side of the side arm 21 of the main part 2.

[0023] In Figs. 4-6 the curved edge 5 of the longitudinal element is also depicted with thin lines, wherein the covering element 1 is mounted in the trapezoidal hinge adjusting notch 51 of this edge 5.
The hinge adjusting notch 51 comprises a flat-bar edge 52 which is located in the space between the central arm 21, the side arm 22 and the second positioning projection 23 of the main part 2 of the element 1.
The central arms 21, 32 of the main part 2 and the bent parts 3 of the element 1 are provided on the circumferentially outer side of the hinge adjusting notch 51 of the edge 5 in a direction parallel to the plane of the frame assembly and abut the circumferentially outer surface of the hinge adjusting notch 51.
Whereas the side arms 22, 32 of the main part 2 and the bent parts 3 of the covering element 1 are located on the outer side of the side surface of this longitudinal projection 5, abutting this side surface.
The first positioning projections 33 extend into the interior of the bent parts of the longitudinal projection 5 on both sides of the notch 51, and the transverse positioning planes 331, and recessed positioning planes 332 of these projections 33 rest on the inner surface of the longitudinal projection 5 with an inwardly curved cross-section, thereby locking the covering element 1 in the hinge adjusting notch 51.

[0024] Figs. 7-12 show a second embodiment of the covering element 1 according to the present invention. Unlike the element of Figs. 3-6, in this second embodiment of the covering element 1, the bent parts 3 are not rectilinear but are arcuate sections with an L-shaped cross-section.
The second positioning projection 23 is in this embodiment a flat-bar projection protruding along its entire length from the opposite edge of the central arm 21 of the main part 2 relative to its side arm 22. As a result, the main part 2 has in this embodiment the form of a U-profile.
This covering element 1 further comprises closing parts 4 extending from the bent parts 3. The end parts 4 have L-shaped cross-sections and include central arms 41 and side arms 42. The side arms 21, 31, 41 of the main part 2, the bent parts 3 and the closing parts 4 are on the same plane. Whereas the central arms 21, 41 of the main part 2 and the closing parts 4 are on planes parallel to each other.
The depth displacement distance D2 of the first positioning projections 33 projecting from the central arms 31 of the bent parts 3 may be in this embodiment defined as the distance from the central arms 41 of the closing parts 4 in a direction perpendicular relative to the planes of these central arms 41. In contrast, the recessed positioning planes 332 can be in this case determined as defined by the first positioning projections 33 on the side of the central arms 41 of the end parts 4.

[0025] Figs. 13-20 show a fragment of an exemplary frame assembly 6 according to the present invention comprising the covering element shown in Figs. 7-12. These figures do not show the entire hinge arrangement and the entire second frame assembly connected with the hinge arrangement to the frame assembly 6 as shown, as in Figs. 1 and 2.

[0026] The hinge member 71 is fixed to the longitudinal element 61 of the frame assembly 6 in a displaceable manner relative to the longitudinal element 61 by means of hinge adjusting means 73 in the plane of the frame assembly 6 and in a direction perpendicular to the longitudinal axis of the element 61. Figs. 14-16 show axonometric cross-section views in different planes of the adjusting means 73, and Figs. 17 and 18 show the hinge adjusting means 73 itself in detail in an axonometric and exploded view. In this case, a specific embodiment of the hinge adjusting means 73 is illustrated in detail, which comprises a body 731 on which the hinge member 71 is fixedly mounted, and a housing 732 which is fixedly attached to the longitudinal element 61 and in which the body 731 is installed in a linearly sliding manner in the direction of an adjustment.
The body 731 includes five sleeves arranged in series and parallel to each other and connected to each other, wherein two outer of this five sleeves are guiding sleeves 733 and the inner three of this five sleeves are adjusting sleeves 734. All sleeves 733, 734 have internal threads.
A chamber 735 is formed in the housing 732 having the shape matched to the shape of the body 731. The chamber includes throughout guiding channels 736 open on both sides and corresponding to guiding sleeves 733, and adjusting channels 737 closed on both sides in which adjustment sleeves 734 are placed.
The guiding sleeves 733 of the body 731 extend from the guiding channels 736 of the housing 732 on the circumferentially outer side of the longitudinal element 61 of the frame assembly 6, and the hinge member 71 is fixedly screwed to these protruding parts of the guiding sleeves 733 by means of mounting screws 7331.
The length of the adjusting channels 737 is greater than the length of the adjusting sleeves 734, so that the entire body 731 and the hinge member 71 mounted on its guiding sleeves 733 are movable with respect to the housing 732 and therefore relative to the longitudinal element 61 of the frame assembly 6.
In the adjusting channels 737 threaded adjusting pins 738 are located and screwed into the adjusting sleeves 734. The adjusting pins 738 rest on their both ends against the end walls of the adjusting channels 737, as a result of which in these adjusting channels 737 they are freely rotatable about their longitudinal axis but not displaceable along their longitudinal axis. Thereby, a rotation of the adjusting pins 738 causes the body 731 with the hinge member 71 to move with respect to the housing 732 and the longitudinal element 61.
The adjusting channels 737 transform on the circumferentially outer side of the housing 732 into access adjusting orifices 739 through which it is possible to provide the adjusting pins 738 with a suitable tool for rotating the pins 738 to adjust the position of the hinge member 71 with respect to the longitudinal element 61 of the frame assembly 6. On the side of the access adjusting orifices 739, the adjusting pins 738 rest on the end walls of the adjusting channels 737 by means of washers 7310 with through holes coaxial with the access adjusting orifices 739.
The cross-section views shown in Figs. 19 and 20 are cross-section views of the frame assembly 6 of Figs. 13-18 taken along the axis of the adjusting pins 738.
Fig. 19 shows an intermediate position of the hinge member 71 located beyond the hinge adjusting notch 51 with the adjusting sleeve 734 positioned in the center of the adjusting channel 737.
Fig. 20 shows a position of the hinge member 71 in the extreme position of its approach to the longitudinal element 61 of the frame assembly 6. In this position, the hinge member 71 is inserted into the hinge adjusting notch 51 and rests against the covering element 1, and the adjusting sleeve 734 abuts against the inner end wall of the adjusting channel 737.

[0027] The figures are not necessarily to scale and some features may be exaggerated or minimized. The above embodiments of the present invention are therefore merely exemplary. These and other factors however should not be considered as limiting the spirit of the invention, the intended scope of protection of which is indicated in appended claims.

List of reference numerals

[0028] 

1

covering element

2

main part
21 central arm
O1 longitudinal axis (central arm (21))

22

side arm

23

second positioning projection
231 transverse positioning edge (plane)

3

bent part
31 central arm
32 side arm
33 first positioning projection
331 transverse positioning edge (plane)
332 recessed positioning edge (plane)

4.

closing part
41 central arm
42 side arm

5

longitudinal projection (of longitudinal frame member 61)
51 hinge adjusting notch
52 flat-bar edge (of the notch 51)

6

frame assembly
61 longitudinal element
62 gap

7

hinge arrangement
71 hinge member
72 pin
73 adjusting means in the plane of the frame assembly and in a direction perpendicular to the longitudinal axis of the longitudinal element
731 body
732 housing
7321 mounting screws
733 guiding sleeve
7331 mounting screws
734 adjusting sleeve
735 chamber
736 guiding channel
737 adjusting channel
738 adjusting pin
739 access adjusting orifice
7310 washer

D1

transverse displacement distance of the positioning projections 33

D2

depth displacement distance of the positioning projections 33

D3

second transverse distance of the second positioning projection 23

G

thickness of the hinge member 71

R', R

range of adjustment

Claims

1. A covering element (1) of a hinge adjusting notch (51) in an edge of an element (61) of a frame assembly (6) defined by a longitudinal projection (5) with a curved cross-section, preferably L-shaped or C-shaped cross-section, characterized in that, it comprises:

a main part (2) with an L-shaped cross section comprising a central arm (21) and a side arm (22), wherein

the main part (2) at both ends transforms into bent parts (3) with L-shaped cross sections comprising central arms (31) and side arms (32),

wherein the side arms (22, 32) of the main part (2) and the bent parts (3) are on the same plane,

and the central arms (31) of the bent parts (3) extend from the central arm (21) of the main part (2) in the direction of the longitudinal axis (O1) of the central arm (21) of the main part (2) and are bent with respect to the plane of the central arm (21) of the main part (2) in the opposite direction relative to the direction of a projection of the side arm (22) of the main part (2),

and wherein

the bent parts (3) comprise first positioning projections (33) protruding from their central arms (31) at transverse displacement distances (D1) from their side arms (32) and at depth displacement distances (D2) from the ends of the central arms (31) of the bent part (3) in the direction perpendicular relative to the plane of the central arm (21) of the main part (2),

wherein the first positioning projections (33) define transverse positioning edges (331), preferably forming positioning planes, on the side of the side arms (32) of the bent parts (3) and recessed positioning edges (332), preferably forming positioning planes, on the side of the ends of the central arms (31) of the bent parts (3), and

the main part (2) comprises at least one second positioning projection (23) protruding from its central arm (21) at a second transverse distance (D3) from its side arm (32), preferably equal to the transverse distance (D1) of the first positioning projections (33),

wherein the second positioning projection (23) defines a transverse positioning edge (231), preferably a positioning plane (231), on the side of the central arm (21) of the main part (2).

2. The covering element according to claim 1, characterized in that, the bent parts (3) transform into closing parts (4) with L-shaped cross-sections and comprising central arms (41) and side arms (42), wherein
the side arms (22, 32, 42) of the main part (2), the bent parts (3) and the closing parts (4) are in the same plane, and the central arms (21, 41) of the main part (2) and the closing parts (4) are in planes parallel to each other,
and wherein the first positioning projections (33) protrude from the central arms (31) of the bent parts (3) at depth displacement distances (D2) from the central arms (41) of the closing parts (4) in a direction perpendicular relative to the planes of the central arms (41) of the closing parts (4),
and wherein the first positioning projections (33) define recessed positioning edges (332), preferably forming positioning planes, on the side of the central arms (41) of the closing parts (4).

3. The covering element according to claim 1 or 2, characterized in that, the bent part (3) is an arcuate section with an L-shaped cross-section.

4. The covering element according to claim 1 or 2, characterized in that, the bent part (3) is a rectilinear section with an L-shaped cross-section and has the central arm (31) protruding from the central arm (21) of the main part (2) at an acute angle (α) with respect to the plane the central arm (21) of the main part (2).

5. The covering element according to any of the claims 1 to 4, characterized in that, the second positioning projection (23) is a flat-bar projection (23) protruding from the opposite edge of the central arm (21) of the main part (2) with respect to its side arm (22).

6. The frame assembly (6) comprising:

longitudinal elements (61) having a peripheral edge defined by a longitudinal projection (5) with an inwardly curved cross-section, preferably L-shaped or C-shaped cross-section, and

the hinge member (71) of the hinge arrangement (7) attached to the longitudinal element (61) and extending through the peripheral edge in a direction perpendicular to the plane of the frame assembly (6) and coupled to adjusting means (73) for adjusting the position of the hinge member (71) relative to the longitudinal element (61) in the plane of the frame assembly (6) in a direction perpendicular to the longitudinal axis of this longitudinal element (61),

characterized in that, a hinge adjusting notch (51) with a flat-bar edge (52) is formed in the longitudinal projection (5) of the peripheral edge, in which a covering element (1) as defined in any one of claims 1-5 is installed, wherein

the flat-bar edge (52) of the hinge adjusting notch (51) is provided in the space between the central arm (21), the side arm (22) and the second positioning projection (23) of the main part (2) of the covering element (1);

the central arms (21, 31, 41) of all parts (2, 3, 4) of the covering element (1) are on the outside of the longitudinal projection (5) of the circumferential edge in a direction parallel to the plane of the frame assembly (6);

the side arms (22, 32, 42) of all parts (2, 3, 4) of the covering element (1) are provided on the outside of the side surface of the longitudinal projection (5) of the circumferential edge; and

the first positioning projections (33) are provided inside the longitudinal projection (5) with an inwardly curved cross-section of the longitudinal element (61) on both sides of the hinge adjusting notch (51), and transverse positioning edges (331) preferably forming the positioning planes, and the recessed positioning edges (332), preferably forming the positioning planes, of the first positioning projections (33) rest on the inner surface of the longitudinal projection (5) of an inwardly curved cross section.

Drawing